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bounce: don't rely on a zeroed bio_vec list 

__blk_queue_bounce() relies on a zeroed bio_vec list, since it looks
up arbitrary indexes in the allocated bio. The block layer only
guarentees that added entries are valid, so clear memory after alloc.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe 2008-12-23 12:44:19 +01:00
parent a0ea862291
commit f735b5eeb9
1 changed files with 7 additions and 2 deletions
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9
mm/bounce.c
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@ -198,8 +198,13 @@ static void __blk_queue_bounce(struct request_queue *q, struct bio **bio_orig,
/*
* irk, bounce it
*/
if (!bio)
bio = bio_alloc(GFP_NOIO, (*bio_orig)->bi_vcnt);
if (!bio) {
unsigned int cnt = (*bio_orig)->bi_vcnt;
bio = bio_alloc(GFP_NOIO, cnt);
memset(bio->bi_io_vec, 0, cnt * sizeof(struct bio_vec));
}
to = bio->bi_io_vec + i;